Deep water hydrostatic head control

Abstract

Hydrostatic head control in the marine riser or sub-sea BOP stack of a deep water drilling unit is maintained through use of an eductor, or similar means, connected to the sub-sea BOP stack choke line for drawing salt water from the sea or mud from the sub-sea BOP stack kill line.

What I claim is: 
     
       1. In a marine riser and BOP stack assembly positioned near the bottom of a water body and having multiple rams, a kill line and a choke line, the improvement to which comprises connecting an eductor to said choke line to receive any kick gas from said assembly through an eductor intake opening wherein said eductor comprises a suction end openable to said water body to allow water to mix with said kick gas in said eductor. 
     
     
       2. In a marine riser and BOP stack assembly positioned near the bottom of a water body and having multiple rams, a kill line and a choke line, the improvement to which comprises connecting an eductor to said choke line to receive any kick gas from said assembly through an eductor intake opening wherein said eductor comprise a suction end openable to said kill line.